Description:This ball head tie rod end holder is designed for RC Airplane, RC Helicopter, RC robot and other models. there are many kinds of model for choose, please choose the correct model before purchasing.Please note: the bottom hole is not with thread. it is a self-tapping hole. Specification & Features:Center Hole Diameter: 2.0mm/0.08 inchBottom Hole Diameter: 1.8mm/0.07 inchTotal Length : 19mm/0.75 inchFit Rod Thread: M2Suitable for RC Airplane, RC Helicopter, RC robot and other models. Item Contains: 5 Pcs x Ball Head Holder Tie Rod End(without Screws and Nut)